More abilities function - JASS

I would like to know how to make an ability that would popup with more abilities.

Example: I press an abilities button and a box that appears like the hero skills box opens up with an ability.

I don't need to know how to make a dummy button, I just need the methods and variables - the ones that would be able to put more hero abilities into the hero skills box and the one that would open it up.

Couldn't you just use the Spellbook spell? or do you want to do something else that i'm not understanding?

Spellbook ability is the one I was looking for, but I also need to know how to add hero skills into the spellbooks.